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Events E and F are such that P("not E or...

Events E and F are such that `P("not E or not F")=0. 25` State whether E and F are mutually exclusive.

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⇒P(E′∪F′)=0.25
⇒P(E∩F) ′ =0.25
⇒P(E∩F)=1−P(E∩F)′
⇒P(E∩F)=1−0.25
...
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